:root {
    --primary: #4CAF50;
    --primary-hover: #388E3C;
    --accent: #2196F3;
    --accent-hover: #1976D2;
    --danger: #f44336;
    --danger-hover: #d32f2f;
    --bg: #f0f2f5;
    --surface: #ffffff;
    --text: #1a1a2e;
    --text-muted: #666;
    --border: #d1d5db;
    --radius: 10px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --transition: 0.25s ease;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 24px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* ─── Logo ─── */
.site-logo {
    position: fixed;
    top: 12px;
    left: 12px;
    width: 52px;
    height: auto;
    border-radius: 8px;
    z-index: 9999;
    transition: opacity var(--transition);
}

.site-logo:hover {
    opacity: 0.8;
}

/* ─── Card ─── */
.container {
    width: 100%;
    max-width: 480px;
    padding: 32px;
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    position: relative;
}

h1 {
    text-align: center;
    margin: 0 0 8px;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
}

h2 {
    text-align: center;
    margin: 0 0 20px;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* ─── Sections ─── */
.hidden {
    display: none !important;
}

.menu {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ─── Buttons ─── */
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 16px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform 0.15s ease;
}

button:active {
    transform: scale(0.97);
}

.restaurantButton {
    background: var(--primary);
    color: #fff;
}

.restaurantButton:hover {
    background: var(--primary-hover);
}

#enterButton {
    background: var(--accent);
    color: #fff;
    margin-top: 6px;
}

#enterButton:hover {
    background: var(--accent-hover);
}

#submitReservation {
    background: var(--primary);
    color: #fff;
    margin-top: 8px;
}

#submitReservation:hover {
    background: var(--primary-hover);
}

/* ─── Back Button ─── */
.backButton {
    position: absolute;
    top: 14px;
    left: 14px;
    background: transparent;
    color: var(--danger);
    font-size: 0.9rem;
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 600;
}

.backButton:hover {
    background: rgba(244, 67, 54, 0.08);
    color: var(--danger-hover);
}

/* ─── Form inputs ─── */
label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin: 12px 0 4px;
    color: var(--text-muted);
}

input {
    width: 100%;
    padding: 11px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    background: var(--surface);
    color: var(--text);
}

input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.18);
}

/* ─── Confirmation ─── */
.confirmation {
    text-align: center;
}

.confirmation h2 {
    color: var(--primary);
    margin-top: 24px;
}

#confirmationDetails {
    line-height: 1.8;
    font-size: 1rem;
    background: #f6f9f6;
    padding: 16px;
    border-radius: var(--radius);
    margin: 16px 0 0;
    border: 1px solid #e0e8e0;
}

/* ─── Footer ─── */
.site-footer {
    width: 100%;
    text-align: center;
    padding: 20px 16px 12px;
    font-size: 0.82rem;
    color: #999;
    max-width: 480px;
}

/* ─── Responsive ─── */
@media (max-width: 520px) {
    body {
        padding: 12px;
    }

    .container {
        padding: 24px 18px;
    }

    .site-logo {
        width: 42px;
        top: 8px;
        left: 8px;
    }

    h1 {
        font-size: 1.3rem;
    }
}